Hand-power rock-drilling machine



(No. Model.) a sheets-sheen 1.

, R. P. BLMORE.

HAND POWER ROOK DRILLINGIMAGHINE. No. 573,454.

Patented Dec. 22, 1896.

3 Sheets-Sheet 2.

Patented 1360.22, 189e.

`(No Model.)

' R. P. ELMORB. 1 HAND POWER ROOK DRILLING MACHINE. No. 573,454.

(No Model.) 3 Sheets-Sheet 3. R. P.'EL1VIORE. HAND POWER ROOK DRILLING MAGHINB.

Patented Dec. 22, 1896.

UNiTED STATES PATENT OFFICE.

RIVERIOUS PALMER ELMORE, OF CHICAGO, ILLINOIS.l

HAND-POWER ROCK-DRILLING MACHINE.

SPECIFICATION forming part of Letters Fatent No. 573,454, dated December 22, 1896. Application iled April 1, 1896. Serial No. 585,723. (No model.)

To all whom t may concern:

Be it known that I, RIvERIoUs PALMER EL- MORE, a citizen of the United States of -America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Hand-Power Rock-Drilling Machines, of which the following is a specification, reference being had therein to the accompanying drawings, and the letters of reference thereon, forming a part of this specification, in which- Figure 1 is a side elevation of the drillingmachine complete as it would appear ready for operation. Fig. V2 is a side view of an extensible supporting-bar for supporting the machine while in operation, a portion being broken away to show its interior parts. Fig. 3 is a vertical cross-section of the machine, taken on line 1 of Fig. l, looking in the direction of the arrow, all the parts for operating and striking the drill-holder being removed. Fig. l is a detail view showing a plan of the pawl for turning the ratchet-wheel on the feed-screw. Fig. 5 is a perspective view of the upper gib for holding the two frames together and for supporting the pawl of the ratchet-wheel on the feed-screw. Fig. 6 is a detail view showing a side view of the springbolt lfor engaging the hammer-handle to give the hammer-stroke and of a part of the frame for carrying said bolt, a coil-spring sleeved thereon, and a longitudinal section of an adjusting-nut fitting the tubular end of said frame for adjusting the tension of said spring; and Fig. 7 is a longitudinal section of the reciprocating drill-holder and a side view of the drill-chuck attached to its forward end. Figs. 8, 9, 10, and`11 are detail views showing more clearly the half-nut and guide-box and its parts in which said nut operates and showing a section of the feed-screw. Fig. 12 is a rear elevation of the hammer and its handle, showing a swinging plate arranged in after each impact of the hammer being withdrawn from the rock, partially rotated, and set back against the rock ready for the next succeeding blow, and in which the operating parts of the machine are carried by a sliding frame or casting which is automatically fed forward as the drilling of the rock progresses; and this invention is intended to be for certain improvements `in the rock-drilling machine described in Letters Patent of the United States No. 307,733, dated November 4, A. D. 1884, and also in Letters Patent of the United States No. 368,658, dated August 23, A. D. 1887, said improvements comprising a new ratchet device for rotating the ratchet-wheel on the feed-screw shaft, a new spring-latch-locking device for preventing rotation of the drill-holder when the drill is being placed in or removed from its chuck, a new device for adjusting the tension olf the hammer-spring, a new spring-catch for preventing backward rotation of the ratchetwheel on the feed-screw shaft, a new springlatch for preventing backward rotation of the drill-holder and its chuck, a hand-wheel on the end of the feed-screw shaft for turning said screw-shaft to adjust the sliding frame,

and in other improvements which are :fully set forth and explained in the following speciiication and claims.

Referringto the drawings, A represents the main frame, consisting of an open rectangular casting having guide-bearings in which the carriage B is fitted to slide and held together by means of gibs n and n', secured to said frame B, and having bearings at its ends in which a feed-screwV is held, so as to rotate freely, but have no end movement.

The main frame A rests on a pedestal F., which stands on a bracket D, having a horizontal eye at its side, through which passes a tubular bar'X, in which is fitted the rod X, having end adjustment inl said tubular rod and held adjusted by means of a pin passing through the pin-holes d, as shown in Fig. 2. The outer end of said tubular rod is provided with a foot-base g, having its face provided with teeth, as shown at h, for bearing against the side of a drift or tunnel, and the rod X is IOO screw-bolt- Z, adapted to be screwed out against the side wall of the drift or tunnel,

' thus forming a solid rest for the machine.

The upper part of the sliding frame B is provided witha longitudinal bore for receiving the drill-holder S2, as shown more particularly in Fig. 7.

A chuck F is secured on the forward end of the drill-holder, and a iianged nut L is turned on its rear extending end beyond the frame B.

J is a heavy screw-bolt fitting a bore in the outer end of the drill-holder and forms a head for the hammer U to strike against.

J 2 is a coil-spring sleeved on the drill-holder S2 between the inner end of the chuck F and an annular offset of frame B, which spring is for the purpose of holding the drill forward and operates to give the drill its stroke when the drill-holder is released after having been moved rearward by the operating devices. The drill-holder chuck is provided with a ratchet-wheel I, having both peripheral and side teeth, as shown in Fig. l. W' hen the drill-holder is moved rearward, the side teeth are engaged by a spring-pawl II on the top of the frame B, and as the drill-holder moves backward against said pawl the said ratchetwheel and drill-holder, to which it is attached, are partially rotated, and the said ratchetwheel is held from backward rotation by means of the spring bolt or latch S' (shown in Fig l) engaging the peripheral teeth of said ratchet-wheel.

Vhen it is desired to take out or replace the drill Gf, it is necessary to have the drillholder S2 held from rotation in either direction while the nutof the chuck is being turned. In order to so hold the drill-holder S2, a spring bolt or latch t' is iitted in the top of frame B, as shown in Figs. l and 7, for dropping into a longitudinal groove P2 in the drill-holder. The barrel 7a4 of said latch is iitted with an adjustingnut Zz', having a groove P across its upper end for receiving the radial arms j of the latch-bolt t' when it is desired to let said bolt or latch down into the groove P2 of said drill-holder for the purpose stated.

It is necessary that the drillholder S2 should be fed forward at or after each stroke. For this purpose the screw-shaft V carries upon it a ratchet-wheel Z. (Shown in Figs. 3 and 4.) This ratchet-wheel is splined upon said screw-shaft in such manner that it may move along in either direction `and at the same time rotate said screwintermittentlyin order to move the carriage B and its working parts toward the work, or, in other words, to feed the drill forward to its work. Said ratchet-wheel extends laterally into a recess in said carriage, so as to travel with it and on said screw-rod. This ratchet-wheel is rotated intermittently by mea-ns of a bell-crank pawl K. (Shown in Figs. l, 3, and 4.) This bell- `crank is pivota-lly connected at Q to the lower end of pin P, which passes up through the head to yieldingly hold said bell-crank up.

against said barrel, so wear will not prevent its proper action on its said ratchet-wheel. The outer end of one of the arms of said bellcrank ratchet-pawl is provided with a pair of upturned lugs O for carrying between them the iiange of the nut L, attached to the outer end of the drill-holder S2, as shown in Figs. 2 and 3, while the outer end of the other arm of said pawl is arranged to engage the peripheral teeth of said ratchet-wheel Z, as shown particularly in Fig. 4E. At each reciprocation of the drill-holder S2 the said ratchet-wheel Z will, through the medium of said bell-crank pawl, be rotated partially, and with it said screw-rod V, which, by means of its connection with a half-nut y, (shown in Fig. 3,) will cause the drill and its carriage to be fed forward to their work. This bell-crank K is one of the new features in this machine. In order to prevent backward rotation of said ratchet-wheel Z, a spring bolt or latch K2 (shown in Figs. l and 4) is used to engage the teeth of said ratchet-wheel. This springbolt used in connect-ion with said ratchet and bell-crank pawl is another new feature in this machine. The screw V is shown in Fig. l as having a hand-wheel T attached to one end. This hand-wheel T is intended to be used for turning said screw-shaft to adjust the sliding frame B forward until the drill engages the rock so as to prevent the nut L on the rear end of the drill-holder from engaging the frame B.

It is necessary when adjusting the carriage B to move it backward to enable the drill to drill a new hole to disengage the half-nut y) (shown in Fig. 3) from the screw V. This is done by means of turning the short shaft r by means of crank J, attached to its outer end. (Shown in Figs. l and 3.) Said shaft has a crank-pin on its inner end, which enters a horizontal recess in the side of said half-nut y, and when said shaft fr is turned it will move said half-nut vertically between guideways in such manner that the said halfnut may be connected or disconnected from said screw, as maybe desired, so the carriage B may move freelyin either direction for the purpose stated. Said guideways are shown at y in Figs. 8 and ll and are integral with plate B. A cap-plate Z2 (shown in Figs. l0 and 11)is secured to said guides by means of cap-screws to hold the nut y in place. The

recess in the nut for the reception of the crank-pin a3 of the shaft r is shown in Fig. ll, and c4 are ribsarranged at the side of the nut for it to bear against and hold the nut a proper distance away from the plate B to leave room between them for the head to which said crank-pin attaches, as shown in said figure.

IOO

IIO

The said half-nut and its guideways are not new in this device, but the means for moving said nut are new. The said drill-holder is operated by means of the lever P4. rIhis lever is pivotally attached at its inner end to the side of the carriage B, as shown in Fig. 1.

G I-I are toggle-arms having their outer ends pivotally connected to the side of carriage B, as shown in Fig. l, the arm H having a slot, as shown in broken lines, so it can have movement on its pivot. These toggle-arms are pivotally connected with lever P4 through the medium of the links L and K3. The inner ends of said links are pivotally connected with each other and to the outer end of the upper fork of the bifurcated arm F, the link K3 having a slot, so it can have end movement on the bolt upon which its inner end is pivoted.

M and N are arms having their inner ends respectively pivoted to the forks of arm F and pivotally connected with each other near their outer ends by means of a pivot-bolt passing through longitudinal slots in such manner that each arm may have end movement on said pivot-bolt.

is a hammer having the end of its han- -dle pivotally attached to the carriage B.

Said hammer-handle has a longitudinal transverse slot in which is arranged a plate S4, adapted to be pivotally held therein at its upper end and adapted to swing in either direction through said slot, so as to be engaged alternately by said arms M and N on either side of said hammer-handle for the purpose of carrying the hammer-handle back against the coil-spring A', which causes the hammer to make a forward stroke against the head J of the drill-holder when said arms, by means of the peculiar form of their ends engaging said plate, become disengaged therefrom, respectively.

In operation when the toggle arms are straightened by means of such connection with lever P4, when it is operated, togglearm I-I is caused to bear against the inner side of the flange of nut L, which carries the drillholder back against its spring. When the joint of the toggles is carried in either direction beyond a line drawn through their point of pivot with frame B, the drill-holder spring will be free to drive the drill-holder and its drill forward to their work, which is permitted by the slots in toggle-arm H and link K3. The said lever P4 and toggles and the parts connected therewith and the hammer and the means for engaging plate Si in the hammerhandle, causing it to make its stroke, are all shown in said patents referred to, so that no further explanation of their construction and operation is necessary, but the new feature connected therewith is in the coil-sprin g de-v said frame being split and its two parts being connected by a clamping-bolt Z2 for tightening said tubular extension upon said hollow nut.

B is a rod having its outer end pass freely through said hollow set-nut and having its inner end formed as a ball for litting a corresponding socket in the hammer-handle, so as to connect them. Said rod has a head on its inner end, and a coil-spring A is sleeved on said rod between its head and inner end of said set-nut. The said set-nut is intended to be turned against said coil-spring for the purpose of regulating its tension to cause the hammer to make a heavier or lighter stroke, according to the quality of the rock to be drilled.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is as follows:

l. In a hand-power rock-drilling machine the combination of frame A, frame B adapted to slide upon frame A, and carrying a reciprocating drill-holder S2 and its spring, screwrod V, jonrnaled in frame A, and having the hand-wheel T on its outer end, ratchet-wheel Z splined on said screw-shaft, and seated in a recess in frame B, bell-crank pawl K pivotally connected at its angle to gib n by means of pin I having the coil-spring mfor yieldingly holding said pawl at its point of pivot, said pawl being adapted to engage and turn said ratchet-wheel by means of one of its arms, and the other arm having the lugs O for carrying between them the 'iiange of nut L on the drill-holder for actuating said pawl,

nut L, half-nut y, and detent-latch K2, all arranged to operate substantially as and for the purpose set forth.

2. In a hand-power rock-drilling machine the combination of the frame B, the reciprocating drill-holder S2 having the longitudinal groove P2, spring bolt or latch 'L' having theA radial arms j near its upper end, and the hollow nut h adapted to screw into barrel h4, and having the radial recess P' across its upper end for receiving arms j, and the coilspring introduced in said barrel around said latch and between a shoulder thereon and the lower end of said nut all arranged to 'operate substantially as and for the purpose set forth.

3. In a hand-power rock-drilling machine the combination of frame B, hammer-handle S pivotally connected at its outer end to said frame, rod B having its inner end connected with said hammer-handle by a ball-and-socket joint, and having its outer end pass freely through hollow nut C', nut C screwed into the screw-threaded extension end of said frame B, and the coil-spring A sleeved on said rod between the head thereof and the inner end of said nut, all arranged to operate substantially asV and for the Vpurpose set forth.

4. In a hand-power rock-drilling machine, the combination of the frame A, frame B adapted to slide on frame A, drill-holder S2 adapted to reciprocate in said frame B and IOO gft 573,454

having the anged nut or head L, and having for actuating said drill-holder and drill and the groove P2, hammer-head J and ratohethammer, allarranged to operatesubstantally Wheel I, coil-spring J 2 sleeved on said drillas and for the purpose set forth.

holder, pawls H and K, spring` bolt or latch R. PALMER ELMORE. for tting the groove in said drill-holder, Vitnesses:

spring-bolt S screw-shaft V, ratchet-Wheel Z H. P. DIOKINSON,

splined thereon, hammer U, and the means J. A. SHERIFFS. 

